Domain Structure in Calcium-Cerium Fluorocarbonate Minerals, Mianning County, Sichuan Province, China
来源期刊：JOURNAL OF RARE EARTHS2000年第2期
论文作者：PAN Zhao-lu MOU Tao MENG Da-wei WU Xiu-ling
Key words：rare earths; Ca-Ce fluorocarbonate mineral; domain structure; polytype;
Abstract: The domain structures in calcium-cerium fluorocarbonate mineral series from a rare earth mineral deposit within an aegirine alkali granite massif in Mianning County, Sichuan Province, China, were studied by means of transmission electron microscopy. Many categories of domain structures in this mineral series were observed and investigated, including the microtwin domains of parisite-6R2 and B2S-6R, the antiphase domains of B2S-2H. The results show that the antiphase domains which are faults along crystal plane (0001) are formed by the displacement of crystal lattice in c* direction and the displacement is 0.471 nm. A new polytype (B4S2-3R) of regular mixed-layer structure with B4S2 type is found in the domain region of mixed-layer structure.
PAN Zhao-lu1，MOU Tao1，MENG Da-wei1，WU Xiu-ling1
(1.Test Center, China University of Geosciences, Wuhan 430074, China;
2. Laboratory of Atomic Imaging of Solid, Institute of Metal Research, Chinese Academy of Science, Shenyang 110015, China)
Abstract:The domain structures in calcium-cerium fluorocarbonate mineral series from a rare earth mineral deposit within an aegirine alkali granite massif in Mianning County, Sichuan Province, China, were studied by means of transmission electron microscopy. Many categories of domain structures in this mineral series were observed and investigated, including the microtwin domains of parisite-6R2 and B2S-6R, the antiphase domains of B2S-2H. The results show that the antiphase domains which are faults along crystal plane (0001) are formed by the displacement of crystal lattice in c* direction and the displacement is 0.471 nm. A new polytype (B4S2-3R) of regular mixed-layer structure with B4S2 type is found in the domain region of mixed-layer structure.
Key words:rare earths; Ca-Ce fluorocarbonate mineral; domain structure; polytype;
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